WO1995009072A1 - Poignee pour outils a moteur - Google Patents

Poignee pour outils a moteur Download PDF

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Publication number
WO1995009072A1
WO1995009072A1 PCT/EP1994/003235 EP9403235W WO9509072A1 WO 1995009072 A1 WO1995009072 A1 WO 1995009072A1 EP 9403235 W EP9403235 W EP 9403235W WO 9509072 A1 WO9509072 A1 WO 9509072A1
Authority
WO
WIPO (PCT)
Prior art keywords
handle
handle part
fixed
handle according
rotatable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP1994/003235
Other languages
German (de)
English (en)
Inventor
Rainer Eckert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of WO1995009072A1 publication Critical patent/WO1995009072A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/0008—Means for carrying the chain saw, e.g. handles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/04—Apparatus for trimming hedges, e.g. hedge shears
    • A01G3/047—Apparatus for trimming hedges, e.g. hedge shears portable
    • A01G3/053—Apparatus for trimming hedges, e.g. hedge shears portable motor-driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/16—Hand-held sawing devices with circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the present invention relates to a handle for motor-driven tools with an operating element for controlling device functions, in particular for gasoline engine cutters, chainsaws or hedge trimmers.
  • Handheld work tools driven by external energy with rotating or oscillating rotating work tools e.g. Gasoline engine cutters, hedgecutters or chainsaws, which, depending on the work task and the position of the tool, must be held by the operator at different angles of attack, are generally provided with a front and a rear handle for handling.
  • the rear handle In addition to holding and guiding, the rear handle is also used to control motor functions, in particular the engine speed.
  • a movable lever actuated with thumb and index finger is usually attached as the operating element.
  • the front handle of such devices is used exclusively for carrying, guiding and holding and is mostly tubular, transverse to the longitudinal axis of the device, at least partially encircling the device, and is often screwed to the underside and / or a right side surface of the device housing.
  • REPLACEMENT BLA ⁇ (RULE 26) adjusted by the operator.
  • the work tasks relate in many cases to immovable elements, such as house walls, tree trunks, branches or, because of their weight, cannot be brought into a convenient working position by the operator in terms of comfortable, low-fatigue handling of the implement. Therefore, as a rule, the implement itself must always be aligned with its preferably rotating or oscillating rotating cutting tool towards the workpiece, as is the case, for example, with cut-off machines or chainsaws.
  • SPARE BLADE (RULE 26) of the rear handle of the implement, on which there is at the same time a motor control in the form of a speed control, both safe gripping and reliable transmission of feed forces and the support of the implement weight by the operator, avoiding considerable moments as possible.
  • a strong dorsal extension ie an outward deflection of the wrist occurs when the lever for speed control is actuated.
  • a handle for such tools is known, which is mounted in its entirety in a housing supporting the drive motor so as to be rotatable about its longitudinal axis.
  • a locking device is provided on the underside of the handle in order to lock the handle in a rotated working position.
  • the throttle lever of this throttle grip is blocked in the idle position when the latching device is actuated.
  • a handle for motor-driven tools of the type mentioned is known from EP-B1-0 267 472.
  • the handle is the second, rear longitudinal handle of the implement with a throttle lever for controlling the speed of the drive motor and for holding and guiding the implement, and the entire grip surface is mounted around the longitudinal axis of the handle without locking on the implement housing.
  • the implement can be adapted to the work task for vertical and horizontal tool positions and different working heights during operation; however, any changes in torque, resulting in some cases from considerable changes in the cutting resistance of the material to be machined, are also passed on directly to the movable handle and impair the reliable, safe handling of the implement.
  • the invention is therefore based on the object of improving a handle of the type mentioned at the outset such that, with high occupational safety, ergonomically optimal operation of the implement under control of motor functions for different working positions is possible,
  • SPARE BLADE (RULE 26) whereby the operator's wrist area is relieved as far as possible and work can be achieved while avoiding dorsal deflections of the wrist as far as possible.
  • the handle has at least one fixed handle part and the control element is rotatably mounted relative to the fixed handle part about a longitudinal axis thereof.
  • control element for controlling device functions e.g. serves to control the speed of a drive motor
  • the control element for controlling device functions can always be turned to the most ergonomically favorable position, regardless of whether the material is to be processed vertically or horizontally, whether the implement must be operated on the ground, at waist height or in other positions, or is led by left- or right-handed personnel.
  • An excessive dorsal bending of the wrist which not only affects the health of the wrists, but also represents an unstable or unsafe holding state, is thus prevented.
  • Large horizontal dorsal deflections of the wrist as occur in conventional tools for operating a throttle control, are eliminated, particularly in the case of horizontal cuts with gasoline engine cut-off machines or chainsaws.
  • the control element is mounted on a rotating sleeve and forms a rotatable handle part with the latter.
  • the rotating sleeve is arranged adjacent to a front end of the fixed handle part and coaxial with it.
  • the fixed grip part and rotating sleeve have an essentially cylindrical shape with approximately the same diameter. This ensures that the handle is held securely. There is always a sufficiently large hand area on the fixed handle. This is particularly important when machining forces are directed into the handle or heavy work equipment has to be carried.
  • control element can also be operated with other fingers. Even in the event of an accidental slipping on the handle to the front, trouble-free holding of the implement is also ensured.
  • the operating element is an eccentric lever with a control cam projecting with respect to a front end face of the rotating sleeve.
  • the control element is preferably pivotable about a pivot axis perpendicular to the longitudinal axis.
  • a longitudinal actuation device for a speed control device of the drive motor is advantageously engaged with the control cam.
  • the longitudinal actuating device is formed from a longitudinally displaceable tappet and a linkage, at least the tappet being arranged displaceably within the handle end part and being actuatable by the control cam.
  • the pivotable eccentric lever allows a long adjustment path, which enables a gradual fine tuning of the device function. This also represents a for
  • ERSArZBLATT REGEL26
  • the ergonomic solution is a convenient solution.
  • the longitudinal actuation device remains in a position that is independent of this, since the control cam and tappet are only rotatably decoupled from one another in the printing system.
  • a coupling device is preferably arranged in the handle.
  • the clutch device is provided between the fixed handle part and the rotatable handle part and is preferably formed from an axial clutch bearing and at least one pair of friction surfaces and / or a pair of teeth.
  • Such a design of the handle allows the rotating part of the handle to remain in the selected angular position or, depending on the design of the coupling device, to automatically reset the rotating sleeve to a zero position.
  • the latter can e.g. can be achieved in that a pin is provided on the fixed handle part and the rotatable handle part and the pin by means of a spring, e.g. a coil spring, are connected.
  • a spring e.g. a coil spring
  • an angle of rotation o of the rotatable handle part is 180 °.
  • the control element can be rotated to the ergonomically most favorable position for all occurring working positions.
  • an engagement pin on the rotatable or fixed handle part slidably engages in a guide groove on the fixed or rotatable handle part.
  • FIG. 1 is a side view of a handle of a working device in longitudinal section in the starting position according to an embodiment of the invention in a schematic representation
  • FIG. 2 is a view similar to that in FIG. 1 with the control element actuated
  • FIG. 4 shows a sectional view similar to that in FIG. 3 for a rotated position of the rotatable handle part of the handle
  • FIG. 5 is a spatial representation of the handle of FIG. 1,
  • FIG. 6 shows a spatial representation of the handle gripped by an operator in the starting position
  • FIG. 7 is a spatial representation of FIG. 6 in a rotated working position of the implement. Detailed description of the invention and best way to carry out the invention
  • a rear handle 1 of an implement not shown here such as e.g. 1 or a chain saw, is shown schematically in FIG. 1 and has a fixed, cylindrical handle part 2 and, adjacent to a front end of the fixed handle part 2, a handle part 3 which is rotatable relative to the latter and has essentially the same diameter.
  • a front, stationary handle end part 4 which is designed as a hollow cylinder body, to form a housing 9 of the working device (not shown in more detail).
  • the handle end part 4 could also form an integral part of the housing 9.
  • a speed control device and a drive motor are accommodated in the housing 9 of the implement - not shown for reasons of clarity.
  • a rotating or oscillating rotating cutting tool is located at the front end of the implement and a second, front carrying and guide handle is attached to the housing.
  • the rear handle 1 is also used to hold and guide the implement and to control the speed of the drive motor.
  • the latter has a rotating sleeve 6 of the rotating handle part 3 which can be rotated about a longitudinal axis 5 of the handle 1 and has an eccentric lever 7 which is rotatably mounted in a slot recess, the rotating axis 12 of which is essentially perpendicular to the rotating axis 5 of the rotating sleeve 6 and runs beneath it, as can be seen from FIGS. 1 and 2.
  • 1 shows the eccentric lever 7 in its rest position
  • FIG. 2 shows the actuated position of the eccentric lever 7 for speed control of the drive motor.
  • a longitudinal actuation device 13 for a speed control device of the drive motor is arranged within the handle end part 4, which is designed as a hollow cylinder part, consisting of a cylindrical tappet 14 and a linkage 15 which is biased in the direction of a control cam 11 of the eccentric lever 7, so that the Control cam 11 of the eccentric lever 7 is in a constant pressure position on a rear side of the tappet 14 and the longitudinal confirmation device 13 is displaceably mounted.
  • the speed control device can be, for example, a throttle valve of a carburetor of a gasoline drive engine.
  • the mounting of the eccentric lever 7 on the rotating sleeve 6, which is rotatable relative to the fixed handle part 2, has the advantage that the eccentric lever 7 is always held in the most comfortable angular position relative to the fixed one, while the rear handle 1 is held firmly in a different working position of the implement Handle part 2 can be brought so that the eccentric lever 7 can be comfortably gripped and actuated by the operator's thumb and / or index finger without considerable dorsal deflections occurring in the wrist area.
  • the rotating sleeve 6 it would also be conceivable to arrange the rotating sleeve 6 so that it can rotate about a parallel axis to the longitudinal axis 5, so that the embodiment is not limited to the coaxial arrangement as shown in the figures.
  • a coupling device 16 which in the present exemplary embodiments is formed by a friction disk 17 which can be rotated in a stationary manner or about a pivot axis supporting the rotating sleeve 6.
  • the twisting force which is necessary for rotating the rotating sleeve 6 can be made adjustable, in particular giving the rotating sleeve 6 a stiffness in the selected rotational position or (when rotating the rotating sleeve 6 against a spring force) also for resetting dersel ⁇ ben or bias of the rotary sleeve 6 are provided in an initial position.
  • the coupling device 16 can also be used in other ways, e.g. are formed by pairs of teeth, which determine the excellent angular positions of the rotating sleeve 6 and, if necessary, in addition to the continuous rotating adjustability of the rotating sleeve 6, also permit rapid adjustment to discrete angular positions.
  • FIG. 3 shows a cross section through the rotatable part along the line AB in FIG. 1 near the friction disk 17 or the fixed handle part 2 in an unactuated initial position of the rotating sleeve 6.
  • the friction disk 17 which is also characterized by a roughness profile or interlocking elements on the opposite end faces of the rotating sleeve 6 and the fixed handle 2 could be replaced, it is in principle possible to give the rotating sleeve 6 with the eccentric lever 7 a steady state in any rotational position so that the rotating sleeve 6 does not move automatically adjusted.
  • SPARE BLADE (RULE 26)
  • another embodiment is shown, in which namely the rotating sleeve 6 is fixed to stationary elements of the fixed handle part 2 by means of a spring pretensioning device 20, so that the rotating sleeve 6 is continuously inserted in the position shown in FIG ⁇ showed the initial position, but with a relatively small force, is biased so that after releasing the eccentric lever 7 or the rotating sleeve 6, this automatically resets itself to the starting position shown in FIG. 3.
  • the fixed handle part 2 and the rotating sleeve 6 each have a pin 18, 19 in an adjacent position to one another when the rotating sleeve 6 is in its initial position, as shown in FIG. 3.
  • a spiral spring 20 with outward-pointing legs 20a is accommodated, the two legs 20a of the biasing spring 20 being arranged on both sides of the pins 18, 19 in the starting position;
  • the spring legs 20a point perpendicularly downward at right angles to the longitudinal axis 5.
  • an arcuate guide groove can be formed, in which the engagement pin 19 of the rotary sleeve 6 engages and which at the same time forms a limiting device for the maximum angle of rotation of preferably 180 ° of the rotatable handle part 3.
  • Fig. 5 illustrates with arrow A the rotatability and direction of rotation of the entire rotatable handle part 3, consisting of the rotating sleeve 6 and the eccentric lever 7 (throttle lever) in a spatial representation, the rotatable handle part 3 in a central section between the outwardn, fixed handle part 1 and the front, fixed handle portion 4 is rotatably arranged.
  • the direction of actuation for pivoting the eccentric lever 7 is shown by the arrow B.
  • the handle part 1 is given an ergonomically favorable adaptation to the hand grip of an operator, as shown in FIG. 6, by a concave / convex design, preferably in its lower width (in normal position).
  • a U-shaped protective bracket 22 which is integral with the housing 9 and which not only gives the partially rotatable handle 1 high storage stability but also forms a protection for the eccentric lever 7 against unintentional actuation and Protects the operator's hand when working with the implement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Harvester Elements (AREA)

Abstract

Une poignée pour outils à moteur, tels que tronçonneuses à meule, scies à chaîne ou similaire, comprend un élément de commande des fonctions de l'outil, par exemple la vitesse de rotation du moteur. La poignée comprend au moins un élément de poignée fixe et l'élément de commande est monté rotatif par rapport à l'élément fixe autour d'un axe longitudinal de celui-ci. L'invention permet à l'utilisateur d'utiliser et d'actionner l'élément de commande sans se fatiguer indépendamment de la position de travail de l'outil.
PCT/EP1994/003235 1993-09-28 1994-09-28 Poignee pour outils a moteur Ceased WO1995009072A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934332986 DE4332986C2 (de) 1993-09-28 1993-09-28 Handgriff für motorgetriebene Arbeitsgeräte mit verstellbarem Bedienelement
DEP4332986.1 1993-09-28

Publications (1)

Publication Number Publication Date
WO1995009072A1 true WO1995009072A1 (fr) 1995-04-06

Family

ID=6498836

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/003235 Ceased WO1995009072A1 (fr) 1993-09-28 1994-09-28 Poignee pour outils a moteur

Country Status (2)

Country Link
DE (1) DE4332986C2 (fr)
WO (1) WO1995009072A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5778649A (en) * 1995-09-20 1998-07-14 Aktiebolaget Electrolux Power-driven hedge trimmer
US9572302B2 (en) 2006-04-10 2017-02-21 Andreas Stihl Ag & Co. Kg Outdoor power tool

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19622594A1 (de) * 1996-06-05 1997-12-11 Gardena Kress & Kastner Gmbh Motorisch betriebenes Handgerät
US5882249A (en) * 1997-11-10 1999-03-16 Ferland; Marc Concrete finishing machine
DE19926375A1 (de) * 1999-06-10 2000-12-14 Gardena Kress & Kastner Gmbh Motorbetriebenes Gartenwerkzeug, insbesondere Heckenschere
ATE327863T1 (de) 2002-01-10 2006-06-15 Black & Decker Inc Getriebegehäuse
DE10336874A1 (de) * 2003-08-11 2005-03-10 Hilti Ag Griffanordnung
US7752760B2 (en) 2005-06-30 2010-07-13 Black & Decker, Inc. Portable trimmer having rotatable power head
DE102024001012A1 (de) * 2024-03-28 2025-10-02 Tomas Schreiber Daumengashalterung für eine Schubkarre und Aufrüstkit für eine Schubkarre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823474A (en) * 1973-05-02 1974-07-16 Inst Cercetari Si Proiectari P Carrying frame for power saw
EP0267472A1 (fr) * 1986-11-06 1988-05-18 Bengt Arvidsson Moyens de préhension d'un outil portable à moteur
WO1992013678A1 (fr) * 1991-01-31 1992-08-20 Robert Bosch Gmbh Outil electrique a main

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE395849B (sv) * 1975-02-18 1977-08-29 Atlas Copco Ab Handtag for slaende verktyg
DE9018178U1 (de) * 1989-09-08 1998-04-09 Fa. Andreas Stihl, 71336 Waiblingen Handgeführtes Arbeitsgerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823474A (en) * 1973-05-02 1974-07-16 Inst Cercetari Si Proiectari P Carrying frame for power saw
EP0267472A1 (fr) * 1986-11-06 1988-05-18 Bengt Arvidsson Moyens de préhension d'un outil portable à moteur
WO1992013678A1 (fr) * 1991-01-31 1992-08-20 Robert Bosch Gmbh Outil electrique a main

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5778649A (en) * 1995-09-20 1998-07-14 Aktiebolaget Electrolux Power-driven hedge trimmer
US9572302B2 (en) 2006-04-10 2017-02-21 Andreas Stihl Ag & Co. Kg Outdoor power tool
US9943039B2 (en) 2006-04-10 2018-04-17 Andreas Stihl Ag & Co Kg Outdoor power tool

Also Published As

Publication number Publication date
DE4332986C2 (de) 1999-03-11
DE4332986A1 (de) 1995-03-30

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